a. an electron because of its smaller mass
b. a proton because of its larger mass
c. an electron because it doesn't feel the nuclear force
d. a proton because it doesn't feel the nuclear force
e. an electron because of its smaller charge

Generally speaking, more massive objects follow the laws of Newtonian mechanics more closely and have less position uncertainty because of their higher momentum, compared to a less massive object with the same velocity. This is a result of the Heisenberg uncertainly principle. Therefore I agree with your answer.

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